Donald Knuth is the guy who invented LaTeX, and it turns out that today (Thursday, as I write this) is his 70th birthday. For a nice article about him and what he’s done in computer science in addition to inventing , go here, or here, or follow the links they give!

Jeffrey, you are absolutely correct. Thanks for pointing that out. I certainly do not want to detract from Leslie’s contribution!

We might take this moment to think of just how many people have contributed – not only to TeX, LaTeX, etc. But also to many of the projects whose fruits we enjoy – as well as to all of those who have created the vast material of mathematics that we get to play with today!